# Page Not Found

The URL `files/JsnXBS0PZNy5MIkqf0xi` does not exist. This page may have been moved, renamed, or deleted.

## Suggested Pages

You may be looking for one of the following:
- [Decision Making](https://www.designreference.xyz/cognitive-tools/universal/decision-making.md)
- [Design Brief](https://www.designreference.xyz/ux-methods/discovery/design-brief.md)
- [Designing with AI](https://www.designreference.xyz/more/ai/designing-with-ai.md)
- [Usability Testing Platforms](https://www.designreference.xyz/ux-methods/testing/usability-testing-platforms.md)
- [Systems Thinking](https://www.designreference.xyz/cognitive-tools/universal/problem-solving/systems-thinking.md)

## How to find the correct page

If the exact page cannot be found, you can still retrieve the information using the documentation query interface.

### Option 1 — Ask a question (recommended)

Perform an HTTP GET request on the documentation index with the `ask` parameter:

```
GET https://www.designreference.xyz/cognitive-tools/universal/decision-making.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

### Option 2 — Browse the documentation index

Full index: https://www.designreference.xyz/sitemap.md

Use this to discover valid page paths or navigate the documentation structure.

### Option 3 — Retrieve the full documentation corpus

Full export: https://www.designreference.xyz/llms-full.txt

Use this to access all content at once and perform your own parsing or retrieval. It will be more expensive.

## Tips for requesting documentation

Prefer `.md` URLs for structured content, append `.md` to URLs (e.g., `/cognitive-tools/universal/decision-making.md`).

You may also use `Accept: text/markdown` header for content negotiation.